The graphs of checked mail are of mail transactions instead of addressees;
a single message addressed to 1 or 1000 people is counted as 1.
Mail messages with total target counts larger than 10 are
bulk mail and so possible spam.
Messages with target counts of millions or "many" have been
declared spam by at least one target DCC client.
Such messages are likely spam
because at least one copy has been manually reported as spam,
detected as spam by a mechanism such as SpamAssassin
or sent to a spam trap, a mailbox not used by a person
but targeted only by spam.

These graphs are generated from
cdcc stats
values.
The scripts that
get and
collect
the data into
RRDTOOL
database and then
render the graphs
are in the DCC source.
All dates and times are in UTC, which is between 3 and 7 hours ahead of
time in the U.S.